My son broke the rear yoke and u-joint dropshifting. We replaced the yoke and the seal at the t-cAse output (it broke too) and put a new u-joint. Now "Vibration noise on decelaeratio and downhill in drive coming from rear end. " he's 18 and I was involved in everything exept the u-joint. He did that while I was at work. It's stock and never did this before. The noise sounds like what some older cars sounded like in reverse.